Abstract The Crosby Warren Field is located onshore the UK, south of the Humber Estuary. It was discovered by RTZ Oil & Gas with the CW-1 (L46/12-3) well in 1986. The oil reservoir is Carboniferous, Namurian, Beacon Hill Flags sandstone, with gas found in Namurian sandstones of the Rough Rock, and the discovery well originally flowed waxy 40° API oil at rates of 45 bopd, which increased to nearly 700 bopd following fracture stimulation. The Beacon Hill Flags are a 10 m-thick group of laminated sandstones within a substantial gross thickness of sandstones, silts, muds and occasional thin claystones. The expected ultimate recovery for the field will be about 0.9 MMbbl of oil and 0.7 bcf of gas. Almost all of the oil and gas have already been recovered, and end of life for the field is expected to be in 2022.

Abstract The Full-Scale Demonstration Of Plugs And Seals (DOPAS) Project is a European Commission programme of work jointly funded by the Euratom Seventh Framework Programme and European nuclear waste management organizations (WMOs). The DOPAS Project aims to improve the industrial feasibility of plugs and seals, the measurement of their characteristics, the control of their behaviour over time in repository conditions, and their hydraulic performance with respect to safety objectives. Within the project, an approach has been developed and applied to assess the compliance of two of the full-scale experiments to their design bases. The approach involves a review of each requirement in the design basis and the strategy used to demonstrate compliance of the experiment with that requirement. Feedback in the form of proposed updates to the design statements is captured by this approach. Learning points on plugs and seals from the compliance assessment are also noted for consideration in the DOPAS Project outcomes. This developed compliance and assessment approach can be employed as part of, or in conjunction with, other more generic approaches used by WMOs, including monitoring, full-scale testing and the documentation of construction procedures.